R包.png
install.packages(“包”)
BiocManager::install(“包”)
library(包)
require(包)
mutate(test, new = Sepal.Length * Sepal.Width)#新增列
select(test,1)#按列序號篩選
select(test, Petal.Length, Petal.Width)#按列名篩選
filter(test, Species == "setosa"&Sepal.Length > 5 )#篩選行
arrange(test, Sepal.Length)#默認從小到大排序
arrange(test, desc(Sepal.Length))#用desc從大到小
summarise(test, mean(Sepal.Length), sd(Sepal.Length))# 計算Sepal.Length的平均值和標(biāo)準差
# 先按照Species分組，計算每組Sepal.Length的平均值和標(biāo)準差
group_by(test, Species)
summarise(group_by(test, Species),mean(Sepal.Length), sd(Sepal.Length))
test %>%
group_by(Species) %>%
summarise(mean(Sepal.Length), sd(Sepal.Length))
count(test,Species)#統(tǒng)計某列的unique值
